Layouts and responsive (newbie question heelp)

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Hi all,

I met Concrete5 from very little time, and I'm still exploring its functionalities.
Big question about responsibe layouts:
Can I change the layout of a page depending on the screen size / device? I am talking of the blocks positioning, not just the CSS?
Can you point me to the right direction? Do I achieve this extending functionalities or is there a way to do this just from the editor?

Thanks a lot for any information you can give me.